Datasheet

Clicking on the left-hand side of the text editor will set a breakpoint on line 69 in the image below, for example, and

the selecting Debug > Reset > Reset & Run from the menu or icon will cause the board to reset, and you should stop

at the breakpoint you set:

You can experiment with adding some of the other debug windows and options via the View menu item, such as

the Call Stack which will show you all of the functions that were called before arriving at the current breakpoint: